Earl httber



E. HUBER. LOCKING KEY FOR BRAKE SHOES. APPLICATI man NOV. I5. 19171,304,049. Patented May 20, 1919.

i liq/Ersatz far/Ember.

iFOJEISIL'YaS- UNITED STATES PATENT OFFICE.

EAnI. HUBER, or CLE ELAND, oIIIo, ASSIGNOR 'ro CIIICAoo IzAInwAYEQUIPMENT COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or ILLmoIs.

LOCKING-KEY FOB BRAKE-SHOES.

Specification of Letters Patent.

Patented May 20, 1919.

Application filed November. 15, 1917. Serial No. 202,829.

To all whom it may concern:

Be it known that I, EARL HUBER, a citizen of the United States, and aresident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented a new and useful Improvement in Locking-Keys for Brake- Shoes,of which the following is a specification, the principle of theinvention being herein'explained and the best mode in which I havecontemplated applying that principle, so as to distinguish it from other1nventions. j

The present invention relates to keys for holding brake shoes to brakeheads and more particularly has for its object the provision of a keywhich can be used with the standard brake head and shoe of the MasterCar Builders Association and which will be securely locked in positionwhen in use so that it cannot loosen and fall out as do keys of thepresent type. To the accomplishment of the foregoing and related ends,said invention, then, consists of the means hereinafter fully describedand particularly pointed out in the claim.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention may be used.

In said annexed drawing:

Figure 1 is a perspective view of my improved key; Fig. 2. is a verticalsection through a brake head and shoe showing my improved key inposition,'and Fig. 3 is a sectional view taken on the line 3-3 Fig. 2.

The drawings show a standard brake head and shoe of the Master CarBuilders Association, which is the equipment used on all the railroadsin this country. As shown, the brake head 1 is provided with two contactlugs 2, between which is a slot adapted to be engaged by the center lug3 formed on the rear face of the brake shoe 4. The two ends of the brakehead are U shaped, whlch provides an opening 5 through which a key 11maybe inserted.

The two lugs 2 on the brake head 1 and the center lug 3 on the shoe 4have alined openings 6 and 7 through which the key 11 is adapted to bepassed. As shown in Fig.

2, these openings are not in direct alinement, but the rear wall 8 ofthe opening 7 through the center lug isin front of the walls 9 of theopenin 6 through thelugs on the brake head. his allows the key tocontact the front walls 10 of the apertures 6 through the brakehead lugsand the rear wall 8 of the aperture 7 through the lug on the brake shoe,thus keeping the brake shoe tight against the forward faces of the lugson the head.

The present key 11 is of the same eneral form as the key made standardby tfi e Master Car Builders Association, being curved slightly andtapering from one end to the other. The key is provided at its outer endwith a projection or lug 12 formed on theooncave side 13 of the key head14. r

. The lug 12 is preferably formed by bodily bending the key near itsheaded end thus preserving the same thickness of metal throughout thelength of the key, and enabling such jog'or bend to be formed either atthe time the key is forged (if such is its method of manufacture) ormalleableized, or after the key is made. Thus it is possible to use oldtypes of keys before or after they are placed in service, and shape themto form the locking projection shown. This locking projection, whenformed, provides anti-clinal .surfaces' which are adapted to cam the keyin its movement both into and out of engagement with the shoe, and hencethe key is easily manipulated while the locking' projection provides aneflicient and secure lock for preventing loss or accidental displacementof the key and shoe.

The key will be driven in placeas usual and when forced through theopenings in the lugs will be in the position shown in Fig. 2 with theprojection 12 forced below the extending portion 15 of the brake shoe,thus locking the key in position and preventing the accidental removalof the same.

As the key is the only look between the shoe and the head, it will bereadily seen that the loss of the key allows the brake shoe to fall out.The shoe contacts with the brake head on the lugs 2 and has aclearanceat the ends as shown at the points 16 which adjacent the key allows theshoe to rock slightly and aline A of the standard key (here shown indotted lines under the point 17 on the brake head).

By my present locking means I can use a much shorter key than is nowstandard, thereby effecting a saving in metal and yet the key issecurely locked in position at all times. The removal of the key is asimple matter as it merely has to be sprung back sufliciently to allowthe projectlon to pass the point on the shoe and this is easily done asthe rounded surface of the prQ ection will readily come over the shoeonce it is started.

Other modes of applying the principle of my invention may be employedinstead of 'the one explained, change being made as regards themechanism herein disclosed, proweenie vided the means stated by thefollowing claim, or the equivalent of such stated means, be employed.

1 therefore particularly point out and distinctly claim as my inventionA locking key for brake shoes which is slightly curved and tapered andwhich key is also provided with a locking projection near the extremityof its thickened end, said locking projection having anti-clinal cammingsurfaces adapted to cam the key in its movement both into and out ofengagement with the shoe.

Signed by me, this 13th day of November, 1917.

EARL HUBER.

